stereo phase polarity(corelation) test, balance audio signal with oscilloscope + XLR INPUT preamp

Описание к видео stereo phase polarity(corelation) test, balance audio signal with oscilloscope + XLR INPUT preamp

sound recording is not perfect because of camcorder recording.
FLUXION design RL-320XLM ; XLR input by 2 12AU7 tubes.

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